First draft for participation request workflow

composer.json

@@ -12,42 +12,44 @@
     "require": {
         "php": "^7.2",
         "ext-json": "*",
+        "alterphp/easyadmin-extension-bundle": "^2.1",
         "easycorp/easyadmin-bundle": "^2.1",
         "knpuniversity/oauth2-client-bundle": "^1.15",
         "league/oauth2-google": "^3.0",
         "myclabs/php-enum": "^1.6",
         "php-translation/symfony-bundle": "^0.5.0",
         "sensio/framework-extra-bundle": "^5.2",
         "stof/doctrine-extensions-bundle": "^1.3",
-        "symfony/asset": "^4.2",
-        "symfony/console": "^4.2",
+        "symfony/asset": "^4.3@dev",
+        "symfony/console": "^4.3@dev",
         "symfony/contracts": "^1.1@dev",
         "symfony/debug-pack": "^1.0",
-        "symfony/dependency-injection": "^4.2",
-        "symfony/dotenv": "^4.2",
+        "symfony/dependency-injection": "^4.3@dev",
+        "symfony/dotenv": "^4.3@dev",
         "symfony/flex": "^1.0",
-        "symfony/framework-bundle": "^4.2",
+        "symfony/framework-bundle": "^4.3@dev",
         "symfony/http-client": "^4.3@dev",
         "symfony/maker-bundle": "^1.11",
         "symfony/orm-pack": "^1.0",
         "symfony/profiler-pack": "^1.0",
-        "symfony/serializer": "^4.2",
+        "symfony/serializer": "^4.3@dev",
         "symfony/swiftmailer-bundle": "^3.1",
-        "symfony/translation": "^4.2",
-        "symfony/twig-bundle": "^4.2",
+        "symfony/translation": "^4.3@dev",
+        "symfony/twig-bundle": "^4.3@dev",
         "symfony/webpack-encore-pack": "^1.0",
-        "symfony/yaml": "^4.2",
+        "symfony/workflow": "^4.3@dev",
+        "symfony/yaml": "^4.3@dev",
         "twig/extensions": "^1.5"
     },
     "require-dev": {
         "codedungeon/phpunit-result-printer": "^0.4.4",
         "doctrine/doctrine-fixtures-bundle": "^3.0",
         "friendsofphp/php-cs-fixer": "^2.9",
         "nelmio/alice": "^3.1",
-        "symfony/browser-kit": "^4.2",
-        "symfony/phpunit-bridge": "^4.2",
+        "symfony/browser-kit": "^4.3@dev",
+        "symfony/phpunit-bridge": "^4.3@dev",
         "symfony/thanks": "^1.0",
-        "symfony/web-server-bundle": "^4.2"
+        "symfony/web-server-bundle": "^4.3@dev"
     },
     "minimum-stability": "dev",
     "prefer-stable": true,